Grate.



W. FiSHER GRATE.

APPLlcATlaN FILED Nov.8.19|6.

Patented Feb. 5, 19318..

2 SHEETS-SHEET lllllllllllllIIIIllllIll]lllllllllIllllllllllllllllllIlllllllllllllIIIllllIlIllIll/hVII I 'J WWW ff :jm-mii EM c u ifVfurnace where rarer rrnon.j

GRATE.

Application filed November 8, 1916.

To all whom t may concern.'

Be it know'n that I, WARREN FISHER, a citizen of the United States,residing at N ew Orleans, in the parish of Orleans and State ofLouisiana, have invented certain new and useful Improvements in Grates;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

rEhe present invention relates to improvements in grates, and moreparticularly to improved fire-bars, in which air or other fluid isintroduced from a source of supply through passages and opening, in thefirebars in order to maintain the same at a comparatively lowtemperature, prolonging the life of the fire-bar by preventing theburning and warping thereof, and into the such iiuid will furnish an andaid in the combustion of the fuel. It will also be seen thereis abundantair space in the bars and that the bars can be used for natural draft,and still be amply strong and give high eficiency.

T he improved structure is more especially designed to give good resultsin burning of bagasse and sawdust, or other waste fuels, although itwill be found to give good results in burning wood, coal, or otherfuels. However, it is especially designed for burning bagasse and theair space between the teeth is large.

. One object of the present invention lies increased draft Vin providingthe re-bars of a substantial construction, not to any appreciable extentweakened by the fluid passages and openings, and one in which convenientaccess is to be had for cleaning the same of any ash or foreign matterthat may have found its way into the fluid passages through theopenings. Y It is another object of the present invention to so arrangeand dispose the lugs and openings on the several fire-bars that, whenassembled to form the grate, such lugs will be received between theproximate lugs in the adjacent fire-bar, leaving spaces to either sidethereof where the fluid is directed from the openings therein.

lVith thesevand other' objects in view the invention consists in thenovel details of construction and combinations of parts more Y fullyhereinafter disclosed and particularly pointed outV in the-claims.

ln the accompanying drawings forming Specication of Letters Patent.

Patented lFeb. 5, fdild. serial No. 130,237.

a part of this application, and in which similar reference symbolsindicate corresponding parts in the several views:

Figure l is a fragmentary front view of a furnace showing the grateoperating means.

Fig. 2 is a sectional view through the furnace showing assembledfire-bars composing the grate in top plan.

Fig. 3 is a sectional view taken on the line 3-3 in Fig. 2, with partsbroken away.

Fig. 4 is an enlarged top plan view, partly in section, of an improvedfire-bar constructed in accordance with the present invention.

Fig. 5 is a side elevational view thereof.

Fig. 6 is an end view of the improved bar, and

Fig. 7 is a cross sectional view therethrough on the line 7-7 in Fig. 4.

eferring more particularly to the drawings, 1 designates generally a.furnace structure which is preferably of refractory material, incasedand bound together by the outer metal covering 2, but the outer metalcovering is not necessar and is not always used.

The front of the 3, in which are the usual doors 4 leading to the grate,and through which the fuel is introduced, and the doors 5 through whichaccess is had to the ash pit, indicated at 6 in Fig. 3.

At 7 is indicated a bar extending across the front of the furnace, andat 8 a bearing bar dividing the grate into two parts holding each aseries of the improved lire-bars.

Referring now more particularly to Figs. 4 to 7, inclusive, the improvedfire-bar is designated generally at 9, it being formed with a series oflugs 10 and 11, extending in opposite directions, and the lugs 10 beingin staggered relation to the lugs 1l, as plainly seen in Fig. 4. Theends of the lugs lO and 11 are rounded, as appears in Figs. 6 and 7, toprevent possible burning.

The body 9 of the improved fire-bar is formed with one or more passages12, preferably extending longitudinally as shown, and communicating withsuch passage 12 are a plurality of openings 13 and 14, extending indiverging directions and advantageously inclined in the manner shown inFig. 7. These openings 13 and 14 have their outer ends disposed beneaththe flanges 15 and 16 of the enlarged solid head 17 of the fire-bar,such flanges affording an effective protection for the several openingsfurnace is indicated at l holl'ow trunnions other material enterthepassage 12.-

7 that the edges 18 and 16 are inclined ash released by a preventing anyash or ing therethrough into will be seen from Fig. and 19 of theflanges 15 in such wise that any clinker resting on the head 17 will bedirected beyond the mouths of the openings 13 and 14, and will fall freethereof into the ash pit 6 below the grate.

The head 17 has a shallow channel 2O extending longitudinally of thefire-'bar 9 for yielding a seat for the fuel, and preventing crowding ofthe fuel to one part of the grate. A small amount of ash collects inthis channel when prevents clinkers clinging to the bar. f

The improved fire-bar is supported on 21 and 22, which are incommunication with the passage 12 in the body 9, and are threaded as at24 to receive plugs 23, which may be removed to give access to thetrunnions and passage 12 for purposes of cleaning the same of any ashesthat may have crept through the openings 13 and 14. One trunnion 21 ofeach of the improved fire-bars is elongated over the opposite trunnion22, and in such elongated trunnions 21 are formed ports 25 adapted toregister with similar ports 26 in bearings 27 provided to receive saidelongated trunnions. The bearings 27 are cast or fitted in headers 28and 29 built in the furnace structure 1,

' and placed in communication with a source `of the fuel.

of air or other fluid supply through pipes 30 and 31. Other means may,of course, be furnished for introducing the fluid to the headers 28 and29, and such fluid may be admitted thereto in any other manner thanshown provided it does not alter the opera.- tion of the invention. Thesmaller trunnions 22 of the fire-bars are received in bearings held bythe bearing Fig. 2.

Referring now to Fig. 2, it will be seen that when the various fire-barsare assembled to constitute the grate, they are fitted in close relationwith the lugs 10 of one bar extending midway between the proximate lugs11 of an adjacent fire-bar, leaving spaces 32 and 33 therebetween.

The fluid openings 14 in one side of each fire-bar are arranged oppositethe spaces'32 so as to deliver the air up through the bed This willresult from the inclination upward given said holes. As the air issuesout of the holes upwardly it will draw air from the ash pit beneath upbar 8, for which see through the grate and against the lugs 10V and 11,thus tending to keep said lugs cool, this cooling'effect being furtherassisted by the fluid passing through the passage 12. The combined airdelivered from the holes and the ash pit will contribute to maintain afire of great intensity giving of't1 increased heat.

the bars are shaken, and

Y For the purposes of shaking, the fire-bars may be connected to one ormore operating devices in any way desired. Preferably the grate as shownin Fig. 2 is for purposes of shaking divided into four parts and fourseparate operating devices are provided on the front 3 of the furnace(see Fig. 1). The arms 34 on the fire-bars 9 are connected to rods 35,36, etc., in any desired number and arrangement, such as thatindicatedin Fig. 3, and the rods 35 and 36 are respectively connectedthrough links 37 and 38 with levers 39 and 40, fulcrumedas indicated kat41 and 42 on the convenient position to be operated. I

Latches 43 areprovided to hold the levers in a position where thefire-bars of the grate will be held upright with the lugs 10 and 11extending horizontally; are employed to operatethe several levers.

In the operation of the invention, fuel is introduced through the doors4 and de? posited on the fire-bars 9 composing the grate. bustionproceeds the'finer ashes will pass down through lthe spaces 32 and 33into the ash pit 6, being diverted from the mouths of the fluid openings13 and 14 by front 3 of the furnace in a and handles 44 The fire iskindled and as the com! 'l the inclined edges 1S and 19 on the flanges Athrough the registen 14, where it will be Vdirected-up linto the furnacethroughV spaces 32V and 33, between the lugs 10 and 11, on which it willexert a cooling eect by increasing the furnace draft. The presence offluid in the passages y* 12 will valso have fire-bars 9 as a wholel andwill keep the same at a comparatively low temperature in the furnace,such as will prevent the burning and warping of the fire-bar consequentupon expansion and contraction, and will thus prolong its life.' As theair or other fluid employed passes through the lopenings 13 and 14, itwill come into active contact with the burning fuel, and will riseupwardly through the burning bed, furnish- Ving an increased draft andaiding in the combustion.

The handles 44 may be applied over-the proper levers 39 and 40 when thefire ist-o be cleaned, and the latchesV 43 released,` whereupon,

by oscillating the handles and levers, the fire-bars willY be similarlymoved to swing their lugs 10 and 11 into the vertical position, therebyallowing the ashes-to drop through the spaces therebetween. `f When theteeth on one bar pass between the a cooling eect on the i maare? teethon the adjacent bar they clear out all the grate-bar further havinghollow jourclinker and ash, and quickly clean the lire, nals withinternally threaded ends, one of and prevent the air spaces fromclogging. the journals being enlarged and having an By giving the barspart oscillation the bed opening through the side thereof to com- 5 ofthe fuel is broken and shaken up and municate with a Huid-supply source,and 35 combustion increased. threaded plugs fitting in the ends of saidWhen cleaning is desired, the fire-bars journals, substantially asdescribed. are removed and the plugs 23 are with- 2. A grate including aSeries of fire bars,

drawn, thus giving uninterrupted access to each of said fire bars beingformed of a 10 the passages 12. After the ashes and forone-piece castbody having a longitudinal 40 eign matter have been cleared from thepaspassage and teeth extending in opposite disages 12 and openings 13and 14, the plugs rections and staggered relation, said body 23-may bereplaced and the fire-bars again having a staggered series of openingsconreturned to the furnace. nected with said passage and extending upl5Having thus described my invention, what Ward in divergent relation, oneopening be 4.5 claim and desire to secure by Letters Pating placedbetween each pair of teeth and ent of the United States is: very closeto the face of one of such teeth,

l. A one-piece cast grate-bar formed with Vsuch body being provided witha head hava body having a longitudinal passage and ing a channellengthwise thereof and flanges g@ with teeth extending in oppositedirections projecting over the mouths of said openings, 50 and staggeredrelation, the body having a said flanges having inclined edges, the bodystaggered series of openings connecting with of the fire bar furtherhaving hollow joursaid passage and extending upward in dinals withinternally threaded ends, one of vergent relation, one opening beingplaced the journals being enlarged and having an 25 between each pair ofteeth and very close opening through the side thereof to com- 55 to theface of one of such teeth, such body municate with a iiuid supplysource, and provided with a head having a channel threaded plugs littingin the ends of said lengthwise thereof and flanges projecting journals,substantially as described. over the mouths of said openings, said Intestimony whe1eof,laiiix my signature.

se ianges having inclined edges, the body of l/VARREN FISHER.

@aptes et s patent may be si s ed for ve cents each, by addressing: theCommissioner of Patents,

Washington, D. C.

